A co-worker just upgraded his iMac to Mt. Lion. In Filemaker Pro Advanced 12 (v2) when editing a calculation field, it is impossible to put in two double quote characters to define a text string. When the second is typed in, either the first one or both of them disappear. I'm not kidding, and I'm not smoking anything.

I opened text edit, type in "String" and cut/pasted it into a FM calculation, and did not get the odd behavior.

Anyone seen this? Any wild ideas what it could be, 'cause I'm at a total loss.

Perhaps if you go to System Preferences > Text, you'll find a list of substitutions that are automatically applied, e.g. three stops are replaced by an ellipsis, 'the' replaces a miss-spelled version (I can't demonstrate the miss-spelling, because it gets replaced

When I checked System Prefs > Language & Text > Text the user had added a substitution of null for " and it was enabled. (As I intimated initially, his Windows experience leads him to try odd settings when trying to make OS X behave more like Windows.)

Apparently, Filemaker uses Text Substitutions by default when you are editing an expression, because there is no FM command menu choice for Edit > Substitutions > 'List of Options on/off' like there is in say, Text Edit.